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Premixer assembly for mixing air and fuel for combustion

a technology of premixer and combustion fuel, which is applied in the field of premixer assembly for mixing air and combustion fuel, can solve the problems of increasing the overall size of the combustor and the gas turbine engine, and increasing the cos

Active Publication Date: 2016-12-13
GENERAL ELECTRIC CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a premixer assembly for mixing air and fuel for combustion. The assembly includes multiple tubes that are placed at the beginning of a combustor. One of the tubes has a non-circular section along its length. The non-circular section of the tube has a cross-sectional area that remains constant along its entire length. The assembly also includes a fuel injection aperture located between the inlet and outlet ends of the tube. The gas turbine engine that includes this premixer assembly is also described. The technical effects of the invention include improved fuel mixing and reduced emissions.

Problems solved by technology

Although longer tubes produce better mixing, lengthening of the tube undesirably necessitates additional cost associated with manufacturing of the tube and increases the overall size of the combustor and the gas turbine engine.

Method used

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  • Premixer assembly for mixing air and fuel for combustion
  • Premixer assembly for mixing air and fuel for combustion
  • Premixer assembly for mixing air and fuel for combustion

Examples

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Embodiment Construction

[0022]Referring to FIG. 1, a schematic illustration of an exemplary gas turbine engine 10 is shown. The gas turbine engine 10 includes a compressor 11 and a combustor assembly 14. The combustor assembly 14 includes a combustor assembly wall 16 that at least partially defines a combustion chamber 12. A pre-mixing assembly 20 extends from the combustor assembly wall 16 and leads into the combustion chamber 12. The pre-mixing assembly 20 may also be referred to herein as a “premixer assembly.” As will be discussed more fully below, the pre-mixing assembly 20 receives a first fluid, such as fuel, through a fuel inlet 22 and a second fluid, such as compressed air, from the compressor 11. The fuel and compressed air are then mixed, passed into the combustion chamber 12 and ignited to form a high temperature, high pressure combustion product or gas stream. Although only a single combustor assembly 14 is shown in the exemplary embodiment, the gas turbine engine 10 may include a plurality of...

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Abstract

A premixer assembly for mixing air and fuel for combustion includes a plurality of tubes disposed at a head end of a combustor assembly. Also included is a tube of the plurality of tubes, the tube including an inlet end and an outlet end. Further included is at least one non-circular portion of the tube extending along a length of the tube, the at least one non-circular portion having a non-circular cross-section, and the tube having a substantially constant cross-sectional area along its length

Description

FEDERAL RESEARCH STATEMENT[0001]This invention was made with Government support under Contract No. DE-FC26-05NT42643, awarded by the Department of Energy. The Government has certain rights in the invention.BACKGROUND OF THE INVENTION[0002]The subject matter disclosed herein relates to turbine systems and, more particularly, to a premixer assembly for mixing air and fuel for combustion within a combustor assembly of a gas turbine engine.[0003]The primary air polluting emissions usually produced by gas turbines burning conventional hydrocarbon fuels are oxides of nitrogen, carbon monoxide, and unburned hydrocarbons. It is well known in the art that oxidation of molecular nitrogen in air breathing engines is highly dependent upon the maximum hot gas temperature in the combustion system reaction zone. One method of controlling the temperature of the reaction zone of a heat engine combustor below the level at which thermal NOx is formed is to premix fuel and air to a lean mixture prior t...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F23R3/10F23R3/28F23D14/62F23D14/64
CPCF23R3/286F23D14/62F23D14/64F23R3/10F23R3/283
Inventor YORK, WILLIAM DAVIDJOHNSON, THOMAS EDWARDKEENER, CHRISTOPHER PAUL
Owner GENERAL ELECTRIC CO
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